使用 RSpec 测试警告 [英] Test for warnings using RSpec

问题描述

是否可以使用 RSpec 测试 Ruby 中的警告?

Is it somehow possible to test warnings i Ruby using RSpec?

像这样:

class MyClass
  def initialize
    warn "Something is wrong"
  end
end

it "should warn" do
  MyClass.new.should warn("Something is wrong")
end

推荐答案

warn 定义在 Kernel 中，它包含在每个对象中.如果您没有在初始化期间发出警告，则可以指定如下警告:

warn is defined in Kernel, which is included in every object. If you weren't raising the warning during initialization, you could specify a warning like this:

obj = SomeClass.new
obj.should_receive(:warn).with("Some Message")
obj.method_that_warns

指定在 initialize 方法中引发的警告相当复杂.如果必须这样做，您可以为 $stderr 交换一个假的 IO 对象并检查它.做完例子一定要恢复

Spec'ing a warning raised in the initialize method is quite more complex. If it must be done, you can swap in a fake IO object for $stderr and inspect it. Just be sure to restore it after the example

class MyClass
  def initialize
    warn "Something is wrong"
  end
end

describe MyClass do
  before do
    @orig_stderr = $stderr
    $stderr = StringIO.new
  end

  it "warns on initialization" do
    MyClass.new
    $stderr.rewind
    $stderr.string.chomp.should eq("Something is wrong")
  end

  after do
    $stderr = @orig_stderr
  end
end

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